Rocky Mountain National Park – located between Estes Park and Grand Lake. It is the most popular National Park in the state.

Great Sand Dunes National Park – located near Alamosa and features mountains of sand towering up to 750 feet.

Black Canyon of the Gunnison National Park – located near Montrose.

Mesa Verde National Park – located in southwest Colorado near Cortez.

If you can’t make it this weekend, you still got a few more opportunities for free admission, according to its website. Those days are September 24 for National Public Lands Day and November 11 for Veterans Day.